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In a game a player can solve easy or hard problems. A player earns 30 points for solving an easy problem, 60 points for solving a hard problem. Tina solved 50 problems earning 1950 points, how may hard pixels did Tina solve

Respuesta :

elliottou

Answer:

15 hard problems

Explanation:

set x = easy problems, y = hard

x + y = 50

30x + 60y = 1950

x = 50-y

30(50-y) + 60y = 1950

1500-30y + 60y =1950

1500 + 30y = 1950

30y = 450

y = 15

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